#include<stdio.h>
#include <math.h> 
double fun (double *a, double *b); 
int main ( )
{ double a, b, y;
scanf ("%lf%lf", &a, &b );
 y=fun(&a, &b); printf ("y=%.2f\n", y );
return 0;
}
double fun (double *a, double *b)
{
	double n; 
	n=sqrt(*a)+sqrt(*b);
	return n;
} 
